MAGNETOTRANSPORT AND MAGNETOOPTICS OF INAS1-XSB, AND HETEROJUNCTIONS COMBINATIONS FORMED BETWEEN INAS AND GASB, ALSB OR INAS1-XSBX

Cyclotron resonance and interband measurements are reported in magneti c fields up to 160 T for InAs/InAs1-xSbx superlattices, one of is a '' self-organised'' or ''natural'' superlattice, and InAs1-xSbx epilayers . The samples were grown by MBE at temperatures between 370 degrees C to 500 degrees C. No dependence of the band gap, effective masses or g -values on the growth temperature was detected. Anomalous tilt behavio ur was observed for superlattices. Inversion asymmetry induced spin-sp litting of the subbands in gated InAs quantum wells is investigated by means of the Shubnikov-de Haas effect and cyclotron resonance. The no n-parabolicity was well by Kane theory, although tile measured values of effective mass were substantially higher than predictions. Infrared life time measurements at lengths between 6 and 85 microns are undert aken with free electron lasers InAs/InAs1-xSbx superlattices and InAs/ AlSb quantum wells. Suppression of the Auger recombination times is de monstrated with the superlattices.